and many, many others. I've seen his hymns in Baptist, Anglican, and Methodist hymnals, so I'm assuming he's Protestant in some fashion (although I'd love to know if he is in Catholic hymnals), but I don't know what tradition he himself was.

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Likewise, Isaac Watts held religious opinions that were more non-denominational or ecumenical than was at that time common for a Nonconformist; he had a greater interest in promoting education and scholarship than preaching for any particular ministry.

The generalconsensus is that Watts' father was a dissenter and that Watts followed suit. No denomination truly claim him as "one of their own". That said, his particular congregation was independent in 18th century UK. Now, while that does not necessarily mean that he was of Puritan stock, it means that he was far closer to that than, say, Presbyterian. And, FWIW, the Puritan church in the US predominantly became Congregationalists.

No, he was not an Anglican. "Dissenting" or "Independent" congregations and ministers were those whose faith and practice put them outside the bounds of the Church of England.

They often suffered for this -- Watts' father was imprisoned, and although Watts himself lived in a more tolerant time, he could not attend either Oxford of Cambridge Universities. On the other hand, the congregation he served, St Mark's Independent Chapel, was located in the financial center of London, and included many wealthy and well-connected members.

In Watts' own case, although his theology is said to have less stridently sectarian than than of some other Dissenting ministers, it does seem to have had a few irregularities. For example, I have read that he attempted to mediate between orthodox Trinitarian doctrine and Arianism, with a unique theory about the union of Christ's human soul to the Logos, and by treating the Holy Spirit as a figure of speech.

Welcome to the site! This next has nothing to do with the quality of your answer, it's just standard to help new visitors avoid misunderstanding the site (as I did at first.) As a new visitor, I'd recommend checking out the following two posts, which are meant to help newcomers "learn the ropes": the help page and How we are different than other sites?
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David Stratton♦May 28 '14 at 2:13